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LPU reset issue due to NP-2 freelist disordered

Publication Date:  2014-12-15 Views:  79 Downloads:  0
Issue Description
Product Name:  NE40E. 
Version:-  V600R001C00SPC800 

Fault Information: 
Card hardware becomes faulty, it resets itself & resumed services. 

There is following alarm about this router.

%%01SRM/3/LPURESET(l)[5574583]:LPU1 reset, the reason is NP-2 freelist disordered, and reset lpu.

Handling Process


Form the log ,we found the board resetting reason is NP-2 freelist disordered,that’s means some error caused the NP software runnning exception:-
%%01SRM/3/LPURESET(l)[5574583]:LPU1 reset, the reason is NP-2 freelist disordered, and reset lpu. 

From the dblg log we found the exactly cause is the cache inside the NP chip was faulty:-

01FPI_DBG/6/LOSEHEART_DBGINFO(D)[25066667]:-Slot=1; NP=Egress, EGress NP, Xscale Dbg Info:
Exception Rised : type = 0xffffffff,   T_High=0x00000000, T_Low=0x0378e15e
Task(1)Int(0)= 0x00000001, StackBase = 0xde537000, StackEnd = 0xde527000
Vector = 0x20000010, Cpsr = 0x0000000c, FSR = 0x00000408, FAR = 0x26b0f570

The record FSR=0x408 means the cache   inside the NP chip occurred one bit error ,this kind of error may caused by two probabilities:-
1.  hardware failure
2.  soft error
The  difference  between  the  two  failure  is  hardware  failure  cannot  resume  after  board resetting ,but soft error can And after the board was reset ,the failure resumed itself ,so this problem was caused by the
cache soft error. And about the soft error:- 

Root Cause

Root Cause:-

The cache inside the NP chip occurred soft error.


       Soft errors, the board is ok now, The failure resumed itself after the board resetting automatically


       Soft errors cause the board reset and the probability is very very little and the board can be used too.